Jessica Simpson weight loss: 50 lbs down for Weight Watchers ads

Though there are rumors that
Jessica Simpson is pregnant with her second child, she's still celebrating losing her baby weight with Weight Watchers.
According to People, Simpson has lost 50 lbs. since giving birth to her daughter, Maxwell, on May 1.

Her new ad for the weight loss company's "Expect amazing" campaign will begin airing Dec. 25, and shows her new, svelter look as she rocks flannel and cowboy boots. The commercial (and above photo) was shot in late November in CA.

"Weight Watchers changed my relationship with food, and I feel so much more prepared to make the right choices," she says. "It feels pretty incredible."

Simpson fit into her snug bridesmaid's dress for BFF Cacee Cobb's wedding to "Scrubs" star Donald Faison this weekend. She was escorted down the aisle by Faison's pal Zach Braff.